Remove sRGB pixel config code from DDL tests

More remnants of linear blending.

Change-Id: I35cab7dab63cb392e7427393b2875c234cbb82f0
Reviewed-on: https://skia-review.googlesource.com/146523
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
1 file changed